Parallel Hydrological Model Parameter Uncertainty Analysis Based on Message-Passing Interface

Parameter uncertainty analysis is one of the hot issues in hydrology studies, and the Generalized Likelihood Uncertainty Estimation (GLUE) is one of the most widely used methods. However, the scale of the existing research is relatively small, which results from computational complexity and limited...

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Bibliographic Details
Published in:Water (Basel) 2020-10, Vol.12 (10), p.2667
Main Authors: Yin, Zhaokai, Liao, Weihong, Lei, Xiaohui, Wang, Hao
Format: Article
Language:English
Subjects:
Algorithms
Analysis
Calibration
Computer applications
Computing time
Efficiency
Experiments
Forecasting
Hydrologic models
Hydrology
Parameter sensitivity
Parameter uncertainty
Sampling
Software
Stream flow
Supercomputers
Uncertainty analysis
Values
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Summary:Parameter uncertainty analysis is one of the hot issues in hydrology studies, and the Generalized Likelihood Uncertainty Estimation (GLUE) is one of the most widely used methods. However, the scale of the existing research is relatively small, which results from computational complexity and limited computing resources. In this study, a parallel GLUE method based on a Message-Passing Interface (MPI) was proposed and implemented on a supercomputer system. The research focused on the computational efficiency of the parallel algorithm and the parameter uncertainty of the Xinanjiang model affected by different threshold likelihood function values and sampling sizes. The results demonstrated that the parallel GLUE method showed high computational efficiency and scalability. Through the large-scale parameter uncertainty analysis, it was found that within an interval of less than 0.1%, the proportion of behavioral parameter sets and the threshold value had an exponential relationship. A large sampling scale is more likely than a small sampling scale to obtain behavioral parameter sets at high threshold values. High threshold values may derive more concentrated posterior distributions of the sensitivity parameters than low threshold values.
ISSN:2073-4441
2073-4441
DOI:10.3390/w12102667